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Title
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Crystallographic and magnetic characterisation of the brownmillerite
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Author
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Abstract
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| Sr2Co2O5 with the perovskite-related brownmillerite structure has been synthesised via quenching, with the orthorhombic unit cell parameters a=5.4639(3) Å, b=15.6486(8) Å and c=5.5667(3) Å based on refinement of neutron powder diffraction data collected at 4 K. Electron microscopy revealed LRLR-intralayer ordering of chain orientations, which require a doubling of the unit cell along the c-parameter, consistent with the assignment of the space group Pcmb. However, on the length scale pertinent to NPD, no long-range order is observed and the disordered space group Imma appears more appropriate. The magnetic structure corresponds to G-type order with a moment of 3.00(4) μB directed along [1 0 0]. |
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Language
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English
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Source (journal)
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Journal of solid state chemistry. - London
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Publication
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London
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2011
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ISSN
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0022-4596
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DOI
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10.1016/J.JSSC.2011.01.026
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Volume/pages
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184
:3
(2011)
, p. 649-654
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ISI
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000288587800026
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Full text (Publisher's DOI)
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